refactor: 重构点券代理方法

Signed-off-by: 502647092 <admin@yumc.pw>

src/main/java/pw/yumc/YumCore/plugin/playerpoints/PointAPI.java

@@ -19,6 +19,13 @@ public class PointAPI {
         }
     }
 
+    /**
+     * @return 获取{@PlayerPointsAPI}
+     */
+    public static PlayerPointsAPI getAPI() {
+        return api;
+    }
+
     /**
      * 添加点券
      *